The Stranger Within synopsis

Tortured by the abduction of her 3-year-old son 12 years earlier, Mare (Kate Jackson) does not know what to believe when a young man (Rick Schroder) arrives at her door claiming to be Luke, her long-lost child. While Mare's fiancé, Dan (Chris Sarandon), suspects that Luke is an impostor, Mare is simply happy to have her boy back. But, as Luke reveals his true personality, Mare and Dan fear that allowing him into their lives could have deadly consequences.